RFR: 8365512: Replace -Xcomp with -Xmixed for AOT assembly phase [v2]

[Vladimir Kozlov]

On Thu, 14 Aug 2025 13:38:43 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Ah yes, right, d'uh. I wrote some of that code! Let me rewrite the comment...
>
> // AOT assembly phase submits the non-blocking compilation requests 
>         // for methods collected during training run, then waits for all compilations
>         // to complete. With -Xcomp, we block for each compilation request, which is
>         // counter-productive. Switching back to mixed mode improves testing time
>         // with AOT and -Xcomp.

I updated the comment.

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PR Review Comment: https://git.openjdk.org/jdk/pull/26767#discussion_r2276702337